Which of the following is not correct for electrochemical cell?

Options

A. Convert chemical energy to electrical energy
B. Anode is -ve terminal
C. Cathode is -ve terminal
D. Cathode is +ve terminal

Answer

To determine which statement is not correct for an electrochemical cell, we will analyze each option step by step.

### Step 1: Understand the function of an electrochemical cell
An electrochemical cell is a device that converts chemical energy into electrical energy through redox reactions. This is the fundamental principle behind how these cells operate.

**Hint:** Remember that electrochemical cells are designed to convert energy from one form to another.

### Step 2: Analyze the first statement
The first statement is: "Converts chemical energy to electrical energy."
- This is true. Electrochemical cells indeed convert chemical energy from the reactants into electrical energy.

**Hint:** Focus on the primary function of electrochemical cells.

### Step 3: Analyze the second statement
The second statement is: "Anode is the negative terminal."
- This is also true. In an electrochemical cell, the anode is where oxidation occurs and is considered the negative terminal.

**Hint:** Recall the definitions of anode and cathode in terms of charge and reactions.

### Step 4: Analyze the third statement
The third statement is: "Cathode is the negative terminal."
- This statement is incorrect. The cathode is where reduction occurs and is considered the positive terminal in an electrochemical cell.

**Hint:** Remember that the cathode is associated with reduction and has a positive charge.

### Step 5: Analyze the fourth statement
The fourth statement is: "Cathode is the positive terminal."
- This statement is true. As mentioned, the cathode is indeed the positive terminal where reduction takes place.

**Hint:** Reaffirm the charge characteristics of the cathode.

### Conclusion
After analyzing all the statements, the one that is not correct for an electrochemical cell is the third statement: "Cathode is the negative terminal."

**Final Answer:** The statement that is not correct for an electrochemical cell is: "Cathode is the negative terminal."

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